Maybe add a suitable license

[JanSurft]

Maybe add a suitable license that fits your wish for developing and contribution, I just realized that there is none (unless I oversaw something). :-)

Legally, without a license, no one can use your code.

http://opensource.stackexchange.com/q/1720/775

[tomkahn]

I think the terms of AnkiWeb take care of this:

Sharing Add-ons

You may optionally share an add-on you have created by uploading it to AnkiWeb, and you may download add-ons that others have shared.
As add-ons extend the computer version, they must be licensed under the AGPL3 or a compatible license. If you do not explicitly state a license, it will be assumed to be AGPL3.
Add-ons do not run in a protected environment, so they potentially have full access to your computer. Please understand that add-ons are provided by third parties, and not verified by us, so we can provide absolutely no warranty. You should only use add-ons that you trust.

(Different terms apply for sharing decks on AnkiWeb by the way.)